CN202974921U - Planar oxygen sensor - Google Patents
Planar oxygen sensor Download PDFInfo
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- CN202974921U CN202974921U CN 201220720784 CN201220720784U CN202974921U CN 202974921 U CN202974921 U CN 202974921U CN 201220720784 CN201220720784 CN 201220720784 CN 201220720784 U CN201220720784 U CN 201220720784U CN 202974921 U CN202974921 U CN 202974921U
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- zirconia
- working electrode
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- alumina substrate
- base body
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Abstract
The utility model discloses a planar oxygen sensor with high heating efficiency, high response speed and high intensity. The planar oxygen sensor provided by the utility model comprises three parts including a ceramic heater (1), an aluminum oxide base body (2) and a zirconia base body (3) which are sequentially overlapped from bottom to top, wherein the aluminum oxide base body (2) is provided with a reference air channel (21); an inner working electrode (31) and an outer working electrode (32) are respectively pasted on the upper surface and the lower surface of the zirconia base body (3); a porous protective layer (33) is printed on the outer working electrode (32); an aluminum oxide printing layer (4) and a zirconia printing layer (5) are printed between the aluminum oxide base body (2) and the zirconia base body (3); the aluminum oxide printing layer (4) is printed on the upper side surface of the aluminum oxide base body (2); and the zirconia printing layer (5) is printed on the lower side surface of the zirconia base body (3). The planar oxygen sensor provided by the utility model can be applied to the technical field of automobile engine tail gas detection.
Description
Technical field
The utility model relates to a kind of sensor, relates in particular to a kind of automotive electric injection engine chip oxygen sensor, and this lambda sensor is used for controlling motor car engine Air and fuel ratio, so that the motor vehicle fuel burning is more abundant.
Background technology
The emission detections system that Modern Automobile Engine adopts, its course of work is: detect the oxygen concentration in the waste gas that discharges after the engine cylinder burning, compare with the oxygen concentration of the tail gas that generates under the ideal burning state, by air and the gas proportion of FEEDBACK CONTROL supply engine, realize controlling the purpose that tail gas nuisance quality reduces.Its core component is exactly lambda sensor.
A lot of scientific research institutions and universities and colleges of university and incorporated business all are being devoted to study the novel flat lambda sensor in recent years for this reason.Ripe lambda sensor is comprised of three layers of tabular zirconia plate of flat planar now, wherein outside one deck is as sensitive element, the Pt electrode is prepared in respectively and forms the domestic and foreign work electrode on sensitive element two planes, zirconia matrix inside, middle layer is with air duct, one deck comprises miniature heater circuit in addition, plays the calandria function.At last three layers of zirconia matrix are sintered to one, have so just realized carrying the lambda sensor structure of heating function, reach the purpose that time of working temperature shortens greatly.But this lambda sensor still has problems.This sensor sensing degree is inadequate, because three layers of matrix all adopt zirconia as base material, and zirconic temperature conductivity only has 3W/ (mK), its heat-transfer rate is excessively slow, comprise at bottom the overlong time that heat that the zirconia matrix layer of miniature heater circuit produces is delivered to the sensitive element place that is positioned at the upper strata, make the oxygen content of the quite long end of sensor after just beginning in vehicle exhaust being detected in the time, thereby can't be in time to the combustion control than making adjustment, this has also increased the input of fuel and more serious to the pollution level of environment indirectly; Secondly, only have 3W/ (mK) because of zirconic temperature conductivity, need to expend the heat that more electric energy could obtain equivalent in its heater circuit, its power consumption is serious.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provides that a kind of efficiency of heating surface is high, fast response time, chip oxygen sensor that intensity is higher.
the technical scheme that the utility model adopts is: the utility model comprises from the bottom to top the ceramic heater of stack successively, three parts of alumina substrate and zirconia matrix, be provided with the reference air duct on described alumina substrate, post respectively interior working electrode and outer working electrode on the upper and lower surfaces of described zirconia matrix, be printed on porous protective layer on described outer working electrode, be printed on aluminium oxide printed layers and zirconia printed layers between described alumina substrate and described zirconia matrix, described aluminium oxide printed layers is imprinted on described alumina substrate upper side, described zirconia printed layers is imprinted on the downside of described zirconia matrix.
Leave the breach identical with described reference air duct shape on described aluminium oxide printed layers and described zirconia printed layers, when the described ceramic heater of pressing, described alumina substrate and described zirconia matrix three part, described interior working electrode is in described reference air duct.
Described ceramic heater by ceramic heating body I, ceramic heating body II, be arranged on the heater circuit between described ceramic heating body I and described ceramic heating body II and the heating electrode that is electrically connected to described heater circuit consists of.
the beneficial effects of the utility model are: because the utility model comprises from the bottom to top the ceramic heater of stack successively, three parts of alumina substrate and zirconia matrix, be provided with the reference air duct on described alumina substrate, post respectively interior working electrode and outer working electrode on the upper and lower surfaces of described zirconia matrix, be printed on porous protective layer on described outer working electrode, be printed on aluminium oxide printed layers and zirconia printed layers between described alumina substrate and described zirconia matrix, described aluminium oxide printed layers is imprinted on described alumina substrate upper side, described zirconia printed layers is imprinted on the downside of described zirconia matrix, so, by print aluminium oxide printed layers and zirconia printed layers between described alumina substrate and described zirconia matrix, at described ceramic heater, when described alumina substrate and described zirconia matrix three parts press together, described aluminium oxide printed layers and zirconia printed layers are as transition bed, make the right raising of heterojunction of described alumina substrate and described zirconia matrix, thereby improve sealing and the shock resistance of chip oxygen sensor of the present utility model, improved intensity of the present utility model, the utility model is arranged between ceramic heater and zirconia matrix with alumina substrate, and the temperature conductivity of aluminium oxide is 20～30 W/ (mK), its heat transfer efficiency is high, the heat that produces from described ceramic heater arrives described interior working electrode and this a pair of sensitive element of outer working electrode by described alumina substrate rapidly, when making the oxygen concentration of the utility model in detecting vehicle exhaust, susceptibility is higher, the time of detecting is shorter, thereby make response speed of the present utility model faster, its efficiency of heating surface is also higher.
due to described zirconia printed layers with zirconia as main body, add yttria as stabilizing agent, add again 2～5% aluminium oxide, adopt PVB to be made into and the printing slurry of described zirconia matrix binder phase with system as cementing agent, the utility model adds aluminium oxide in Zirconia body, thereby increased the conjugation between zirconia and aluminium oxide, adopt simultaneously PVB to be made into and the printing slurry of described zirconia matrix binder phase with system as cementing agent, so, in compacting the utility model green compact process, combination between described alumina substrate and described zirconia matrix is tightr, solve simultaneously two kinds of different materials of aluminium oxide and zirconia and burnt altogether hard problem, also strengthened intensity of the present utility model.
Because the static pressure such as the utility model employing are pressed into the lambda sensor green compact to described ceramic heater, described alumina substrate and described zirconia matrix, then fire through 1400～1500 ℃ and form, so, manufacture craft of the present utility model is simple, greatly reduce the input of raw materials for production and artificial input, thereby reduced widely production cost.
Description of drawings
Fig. 1 is blast structural representation of the present utility model.
Embodiment
As shown in Figure 1, in the present embodiment, the utility model comprises from the bottom to top ceramic heater 1, alumina substrate 2 and 3 three parts of zirconia matrix of stack successively.Be provided with reference air duct 21 on described alumina substrate 2, post respectively interior working electrode 31 and outer working electrode 32 on the upper and lower surfaces of described zirconia matrix 3, be printed on porous protective layer 33 on described outer working electrode 32.The material of described porous protective layer 33 is generally the aluminate micro mist.Be printed on aluminium oxide printed layers 4 and zirconia printed layers 5 between described alumina substrate 2 and described zirconia matrix 3, described aluminium oxide printed layers 4 is imprinted on described alumina substrate 2 upper sides, and described zirconia printed layers 5 is imprinted on the downside of described zirconia matrix 3.Measure the difference in oxygen concentration between of the gas between described zirconia matrix 3 upper and lower surfaces at the interior working electrode 31 of described zirconia matrix 3 upper and lower faces and outer working electrode 32, and voltage is controlled in output according to measurement data, makes the fuel air ratio of engine reach best thereby control distributive value.print one deck aluminium oxide printed layers and one deck zirconia printed layers between described alumina substrate 2 and described zirconia matrix 3, at described ceramic heater 1, in the process that described alumina substrate 2 and described zirconia matrix 3 three parts press together, described aluminium oxide printed layers 4 and described zirconia printed layers 5 combine, described aluminium oxide printed layers 4 and alumina substrate 2 combinations that are positioned under it, described zirconia printed layers 5 combines with the zirconia matrix 3 that is located thereon, in this homogeneity cohesive process, combination between described alumina substrate 2 and described zirconia matrix 3 will be tightr, thereby improved intensity of the present utility model.Described alumina substrate 2 and described zirconia matrix 3 all adopt the curtain coating substrate.
Described zirconia printed layers 5 as main body, adds yttria as stabilizing agent with zirconia, then adds 2～5% aluminium oxide, adopts PVB to be made into and the printing slurry of described zirconia matrix binder phase with system as cementing agent.
Leave the breach identical with described reference air duct 21 shapes on described aluminium oxide printed layers 4 and described zirconia printed layers 5, when the described ceramic heater 1 of pressing, described alumina substrate 2 and described zirconia matrix 3 three part, described interior working electrode 31 is in described reference air duct 21, and with wherein air communication.
Described ceramic heater 1 by ceramic heating body I 11, ceramic heating body II 12, be arranged on the heater circuit 13 between described ceramic heating body I 11 and described ceramic heating body II 12 and the heating electrode 14 that is electrically connected to described heater circuit 13 consists of.Well heater adopts pottery to make, and that pottery has advantages of is high temperature resistant, it is fast to conduct heat, insulation is good, so the utility model makes heat transfer efficiency higher with pottery as the heating physical efficiency, conducts heat faster, good insulation preformance.
The static pressure such as the utility model employing are pressed into the lambda sensor green compact to described ceramic heater 1, described alumina substrate 2 and described zirconia matrix 3, then fire through 1400～1500 ℃ to form.
The utility model relates to a kind of automotive electric injection engine with the technical field of flat Zirconium oxide oxygen sensor, especially a kind of plate type oxygen sensor and preparation method thereof.It comprises ceramic heater, zirconia matrix, heating circuit, working electrode, porous protective layer, reference air duct, alumina substrate.Ceramic heater is made by aluminium oxide, in heating line is arranged, the reference air duct is arranged in alumina substrate, zirconia matrix two sides is furnished with the domestic and foreign work electrode, is printed on porous protective layer on the external working electrode of zirconia base.This design has improved the intensity of lambda sensor, utilizes aluminium oxide higher than zirconia heat conduction, makes heat can be transmitted to rapidly the zirconia matrix, has improved the response speed of lambda sensor, and this utility model is easy to produce and reduced to a certain extent cost.
The utility model can be applicable to automobile engine tail gas detection technique field.
Claims (3)
1. chip oxygen sensor, it is characterized in that: it comprises from the bottom to top the ceramic heater (1) of stack successively, (3) three parts of alumina substrate (2) and zirconia matrix, be provided with reference air duct (21) on described alumina substrate (2), post respectively interior working electrode (31) and outer working electrode (32) on the upper and lower surfaces of described zirconia matrix (3), be printed on porous protective layer (33) on described outer working electrode (32), be printed on aluminium oxide printed layers (4) and zirconia printed layers (5) between described alumina substrate (2) and described zirconia matrix (3), described aluminium oxide printed layers (4) is imprinted on described alumina substrate (2) upper side, described zirconia printed layers (5) is imprinted on the downside of described zirconia matrix (3).
2. a kind of chip oxygen sensor according to claim 1, it is characterized in that: leave the breach identical with described reference air duct (21) shape on described aluminium oxide printed layers (4) and described zirconia printed layers (5), when the described ceramic heater of pressing (1), described alumina substrate (2) and described zirconia matrix (3) three part, described interior working electrode (31) is in described reference air duct (21).
3. a kind of chip oxygen sensor according to claim 2 is characterized in that: described ceramic heater (1) by ceramic heating body I (11), ceramic heating body II (12), be arranged on the heater circuit (13) between described ceramic heating body I (11) and described ceramic heating body II (12) and the heating electrode (14) that is electrically connected to described heater circuit (13) consists of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220720784 CN202974921U (en) | 2012-12-25 | 2012-12-25 | Planar oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220720784 CN202974921U (en) | 2012-12-25 | 2012-12-25 | Planar oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202974921U true CN202974921U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220720784 Expired - Fee Related CN202974921U (en) | 2012-12-25 | 2012-12-25 | Planar oxygen sensor |
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| Country | Link |
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| CN (1) | CN202974921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018283A (en) * | 2012-12-25 | 2013-04-03 | 珠海市香之君电子有限公司 | Chip type oxygen sensor |
-
2012
- 2012-12-25 CN CN 201220720784 patent/CN202974921U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018283A (en) * | 2012-12-25 | 2013-04-03 | 珠海市香之君电子有限公司 | Chip type oxygen sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 519000, 3 floor, No. 311 Warwick Road, Guangdong, Zhuhai, two or three Patentee after: ZHUHAI XIANGZHIJUN TECHNOLOGY CO., LTD. Address before: 7, Development Building, 1154 East Jiuzhou Road, 519015, Guangdong, Zhuhai Patentee before: Luckyman Electronic Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20161225 |